Question

Read this sentence.

_____ Americans had known that yellow fever was spread by mosquitoes, the epidemic of 1793 may have been avoided.

Which transition word best connects the ideas?

If
But
Then
Because

Answer 1

If

Step-by-step explanation:

Answer 2

If :)

Step-by-step explanation:

If you read it with the other words, if sounds the more sense with it.